NU606 | NU606 Advanced Pathophysiology Exam 3
Version 2 | Questions with Correct Answers and
Expert Explanation for Each Question | Regis
1. A 55-year-old patient presents with bradykinesia, resting tremors, and muscle
rigidity. Which neurotransmitter deficiency is the hallmark of this condition?
A. Acetylcholine
B. Dopamine
C. Serotonin
D. GABA
Correct Answer: B
Expert Explanation: Parkinson’s disease is primarily caused by the degeneration of
dopamine-producing neurons in the substantia nigra. This depletion of dopamine
disrupts the balance between excitatory and inhibitory signals in the basal ganglia.
Consequently, patients experience classic motor symptoms such as tremors and
stiffness.
2. Which pathological feature is most characteristic of Alzheimer’s disease?
A. Demyelination of peripheral nerves
B. Amyloid plaques and neurofibrillary tangles
C. Dopaminergic neuron loss
,D. Excessive glutamate production
Correct Answer: B
Expert Explanation: Alzheimer’s disease involves the accumulation of amyloid-
beta plaques outside neurons and tau-containing neurofibrillary tangles inside
neurons. These protein abnormalities lead to synaptic dysfunction and eventual
neuronal death. Over time, this process results in significant cerebral atrophy and
cognitive decline.
3. In Multiple Sclerosis (MS), what is the primary target of the immune system’s
attack?
A. The myelin sheath in the central nervous system
B. The neurotransmitters in the synapse
C. The axonal cell body
D. The motor endplate at the neuromuscular junction
Correct Answer: A
Expert Explanation: Multiple Sclerosis is an autoimmune disorder where the
immune system attacks the myelin sheath of the central nervous system. This
demyelination slows or blocks nerve impulse conduction, leading to various
neurological deficits. The inflammation often results in the formation of scar tissue
or plaques throughout the brain and spinal cord.
,4. A patient exhibits ascending muscle weakness starting from the legs and moving
upward. Which condition is most likely?
A. Myasthenia Gravis
B. Guillain-Barré Syndrome
C. Amyotrophic Lateral Sclerosis
D. Multiple Sclerosis
Correct Answer: B
Expert Explanation: Guillain-Barré Syndrome is an acute inflammatory
demyelinating polyneuropathy that typically presents with symmetric, ascending
paralysis. It often follows a viral or bacterial infection that triggers an autoimmune
response against peripheral nerve myelin. If the weakness reaches the diaphragm, it
can lead to life-threatening respiratory failure.
5. What is the underlying pathophysiology of Myasthenia Gravis?
A. Destruction of dopamine receptors
B. Degeneration of upper and lower motor neurons
C. Inhibition of acetylcholinesterase
D. Autoimmune destruction of acetylcholine receptors
Correct Answer: D
, Expert Explanation: Myasthenia Gravis is characterized by the production of
autoantibodies against nicotinic acetylcholine receptors at the neuromuscular
junction. This reduces the number of available receptor sites, making it difficult for
muscles to contract effectively. The most common symptom is muscle weakness
that worsens with activity and improves with rest.
6. Which clinical finding is most suggestive of increased intracranial pressure (ICP)?
A. Cushing’s Triad
B. Increased heart rate and decreased blood pressure
C. Hypothermia
D. Hyperactive bowel sounds
Correct Answer: A
Expert Explanation: Cushing’s Triad is a classic late sign of increased intracranial
pressure and brain stem herniation. It consists of widened pulse pressure
(increased systolic BP), bradycardia, and irregular respirations. Recognizing these
signs is critical as they indicate that the brain’s compensatory mechanisms are
failing.
7. A patient has suffered a traumatic brain injury and has an epidural hematoma.
Which vessel is most commonly involved?
A. Middle cerebral artery
Version 2 | Questions with Correct Answers and
Expert Explanation for Each Question | Regis
1. A 55-year-old patient presents with bradykinesia, resting tremors, and muscle
rigidity. Which neurotransmitter deficiency is the hallmark of this condition?
A. Acetylcholine
B. Dopamine
C. Serotonin
D. GABA
Correct Answer: B
Expert Explanation: Parkinson’s disease is primarily caused by the degeneration of
dopamine-producing neurons in the substantia nigra. This depletion of dopamine
disrupts the balance between excitatory and inhibitory signals in the basal ganglia.
Consequently, patients experience classic motor symptoms such as tremors and
stiffness.
2. Which pathological feature is most characteristic of Alzheimer’s disease?
A. Demyelination of peripheral nerves
B. Amyloid plaques and neurofibrillary tangles
C. Dopaminergic neuron loss
,D. Excessive glutamate production
Correct Answer: B
Expert Explanation: Alzheimer’s disease involves the accumulation of amyloid-
beta plaques outside neurons and tau-containing neurofibrillary tangles inside
neurons. These protein abnormalities lead to synaptic dysfunction and eventual
neuronal death. Over time, this process results in significant cerebral atrophy and
cognitive decline.
3. In Multiple Sclerosis (MS), what is the primary target of the immune system’s
attack?
A. The myelin sheath in the central nervous system
B. The neurotransmitters in the synapse
C. The axonal cell body
D. The motor endplate at the neuromuscular junction
Correct Answer: A
Expert Explanation: Multiple Sclerosis is an autoimmune disorder where the
immune system attacks the myelin sheath of the central nervous system. This
demyelination slows or blocks nerve impulse conduction, leading to various
neurological deficits. The inflammation often results in the formation of scar tissue
or plaques throughout the brain and spinal cord.
,4. A patient exhibits ascending muscle weakness starting from the legs and moving
upward. Which condition is most likely?
A. Myasthenia Gravis
B. Guillain-Barré Syndrome
C. Amyotrophic Lateral Sclerosis
D. Multiple Sclerosis
Correct Answer: B
Expert Explanation: Guillain-Barré Syndrome is an acute inflammatory
demyelinating polyneuropathy that typically presents with symmetric, ascending
paralysis. It often follows a viral or bacterial infection that triggers an autoimmune
response against peripheral nerve myelin. If the weakness reaches the diaphragm, it
can lead to life-threatening respiratory failure.
5. What is the underlying pathophysiology of Myasthenia Gravis?
A. Destruction of dopamine receptors
B. Degeneration of upper and lower motor neurons
C. Inhibition of acetylcholinesterase
D. Autoimmune destruction of acetylcholine receptors
Correct Answer: D
, Expert Explanation: Myasthenia Gravis is characterized by the production of
autoantibodies against nicotinic acetylcholine receptors at the neuromuscular
junction. This reduces the number of available receptor sites, making it difficult for
muscles to contract effectively. The most common symptom is muscle weakness
that worsens with activity and improves with rest.
6. Which clinical finding is most suggestive of increased intracranial pressure (ICP)?
A. Cushing’s Triad
B. Increased heart rate and decreased blood pressure
C. Hypothermia
D. Hyperactive bowel sounds
Correct Answer: A
Expert Explanation: Cushing’s Triad is a classic late sign of increased intracranial
pressure and brain stem herniation. It consists of widened pulse pressure
(increased systolic BP), bradycardia, and irregular respirations. Recognizing these
signs is critical as they indicate that the brain’s compensatory mechanisms are
failing.
7. A patient has suffered a traumatic brain injury and has an epidural hematoma.
Which vessel is most commonly involved?
A. Middle cerebral artery
